Fabric take-up device for flat warp knitting machines



E. H. WIR TH 2,108,737 FABRIC TAKE-UP DEVICE FOR FLAT WARP KNI 'iTING MACHINES Feb. 15, 1938.

Filed July 29, 1937 INVE N TOR MIL nwmrw ATTORNEY Patented Feb. 15," 1938 FABRIC TAKE-UP DEVICE FOR FLAT KNITTING moms mil Herbert Wirth,"Hartmannsdorf, near Chem-- nitz, Germany, assignor to the firma Emil Wirth Wirkmaschinenfabrik, Hartmannsdori, Chemnitz, Germany Application July 29, 1937, Serial No. 156,409

- In Germany August 4, 1936 4 Claima (01. 66-149) near:

s PATENT "OFFICE The present invention relates to flat warp knitting machines'and more particularly refers to a mechanism driven by an endless chain, rope, cord or the like for winding the fabric into a roll in flat warp knitting machines.

According to the 0. 8. Patent 2,064,? 10 granted to applicant, the chain or the like is passed over a. sprocket wheel or cable drum associated with the take-up roller and over a sprocket wheel or cable drumactuated by a ratchet wheel to maintain a substantially constant length of chain or the like between said sprocket wheels and the roller on which thefabric is wound-is driven by a separate and automatically regulatable mechanism. In the chain or thelike'a tension roller is suspended which is loaded by a take-up weight.

In dependence on the constantly increasing take-up tension during knitting, the weight must be altered to obtain as uniforma tension 9f the chain as possible and thereby to warrant an always uniform strength of the fabric. This manner of taking-up the-fabric under the influence of the load on the chain requires a constant control of the fabric take-up device.

The object of the present invention is to provide a device for taking-up the fabric by means of which the disadvantages of the known devices of this kind are avoided. v In an extremely simple manner and independently-on the attention of the operator the new device warrants an absolutely uniform strength of the fabric to be taken-up and thereby prevents the formation of striped goods.

The object aimed at-according to theinvention is substantially obtained by the fact, that the roller, freely suspended in the drive chain or the like, is connected to a fixed bearing mem ber for a spindle, driven by the ratchet gear of the fabric take-up device, by means of a spring and a strap screwed on the spindle and prevented from rotating. e

In the accompanying drawing one construction according to the invention is shown by way of example.

In this drawing:

Fig. 1 is a broken away more or'less diagrammatic side view of the essential parts of a fabric take-up device of the kind shown in the above mentioned U. S. Patent 2,064,710 modified in accordance with the invention, and

Fig. 2 shows an elevation of this device.

The chain 29 or the like influencing the fabric take-up device is, as shown in the U; S. Patent 2,064,710 granted to applicant, guided over sprocket wheels 8 and II and a roller I] provided with a flange on each side. The sprocket wheel 8 ,is fixed upon the shaft 6 and the roller I1 ismounted upon the shaft l6. Differing from the construction shown in the above mentioned pat- 'ent the sprocket wheel H in the present case is mounted upon a hollow shaft 5 in which a solid shaft 1 is arranged carrying a sprocket wheel 53. The latter is connected b an endless chain 54 with a second sprocket wheel 15 of the same diameter as the sprocket 53'. According to the invention the sprocket wheel 15 is fixed upon a shaft 56 which carries a worm 58 engaging a worm wheel 51. The shaft 56 is journalled in a =,frame 59 pivotally connected by a bolt 60 to a bearing member 62 fixed to the machine frame. The bolt 60 passes through the .free end of a prong SI of said bearing member 62. A pawl pivoted to a second prong 63 of the bearing member 62 is provided with a recess 65 which engages over a pin 01 fixed tothe frame 59, whereby the frame 59 usually is held in operative position in which the worm 58 engages the worm wheel 51.

According to the invention, a. tension 'spring 69 is connected to the roller 30, freely suspended in the chain 29, by means of a strap 68. A second strap 10 is suspended at the lower end of the tension spring 69. The strap 10 is provided with 'a female thread cooperating with the thread ll of a spindle I2 carrying the worm wheel 51. A projection 13 of the strap 10 has a recess adapted to slide on a guide pin 14 fixed in the prongs 6| and 63, of the bearing member 62- so that rotation of the strap 10 is prevented. Consequently on turning the spindle H, 12 the strap 10 and the projection 13 are adjusted in a vertical plane, whereby the spring 69 is more or less tensioned, that is to say,the chain29 is more or less loaded.

As by way of the endless chain drive 53, 5,4,

:15 the spindle H, 12 is rotated by the ratchet for the purpose of initially tensioning the spring 69,1. e. if the strap 10 is to be shifted downwardly,

the pawl 65 is disengaged and the frame 59', carrying the shaft 56, is swung around the bolt 60, so that the spindle 1|, I2 and the worm wheel 51 fixed upon the latter maybe freely rotated in its bearings provided in the prongs GI, 63 by means of a hand wheel 16 mounted upon the spindle I2. As soon as the frame is swung into operative position again and the worm 58 is brought into engagement with the worm wheel 51, shifting of the strap II! with respect to the spindle I I, I2 and thereby an alteration of the tension of the spring 69 is prevented, until the shaft 56, carrying the worm 58, is again rotated by the ratchet gear,

the ratchet mechanism influencing the fabric 4 take-up device, and means for resiliently connecting said spindle to said freely suspended roller.

2. In a fabric take-up device for flat warp knitting machines of the kind set forth, a chain driving the fabric take-up device and carrying a freely suspended roller, a bearing member fixed to the machine frame, a spindle journalled in said bearing member, a worm wheel mounted on said spindle, a frame pivoted to said bearing member, a

'to said freely suspended roller, and a spring connected to said straps.

3. A fabric take-up device for flat warp knitting machines of the kind set forth in claim 2 in which said frame carrying said shaft is pivoted by a bolt to a prong of, said bearing member and usually is held in operative position by-a pawl pivoted to a second prong of said bearing member.

- 4. A fabric take-up device for flat warp knitting machines as set forth in claim 2 in which said frame carrying said shaft is pivoted by a bolt to a prong of said bearing member and usually is held in operative position by a pawl pivoted to a second prong of said bearing member, and in which said threaded strap is provided with a projection guided on a rod fixed in said prongs of said bearing member.

EMIL HERBERT W'IR'I'H. 

